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A jet fighter is designed to operate at maximum mach of 2.0. Which of the following is approximated value for empty weight fraction if rubber engine sizing is used? Given, W0 = 20000lb, AR = 5, thrust loading T.L. = 0.6 and wing loading W.L. is 25.

A jet fighter is designed to operate at maximum mach of 2.0. Which of the following is approximated value for empty weight fraction if rubber engine sizing is used? Given, W0 = 20000lb, AR = 5, thrust loading T.L. = 0.6 and wing loading W.L. is 25. Correct Answer 0.8109

Given, jet fighter with maximum Mach number Mmax = 2.0 Gross weight W0 = 20000lb, wing loading = W.L. = 25, Aspect ratio AR = 5, Thrust loading T.L. = 0.6. For, given parameters empty weight fraction is given by, We/W0 = *K Now, for jet fighter a = -0.02, b = 2.16, c = -0.1, d = 0.2, e = 0.04, f = -0.1, g = 0.08, K = 1.0 We/W0 = *1.0 We/W0 = *1.0 We/W0 = -0.02+0.8309 = 0.8109.

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